De Clérambault's syndrome or erotomania is described as a delusional conviction, in which a woman usually believes that an older man of higher social status is passionately in love with her. The patient's relentless pursuit of the delusional love object can eventually involve threats or retaliation, in response to repeated rejection. This case report is about a 42-year-old female who initiated the delusional conviction 19 years ago, after her first pregnancy. She was admitted to our service 3 months ago. In the beginning of the treatment, when the antipsychotic was introduced the patient exhibited decreasing of delusions. This disorder is uncommon but it does not mean that it is rare in our practice. A greater awareness of psychopathological extension may increase the recognition of this psychiatric condition.